CN110797965B - Electricity conversion structure and method - Google Patents
Electricity conversion structure and method Download PDFInfo
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- CN110797965B CN110797965B CN201910965666.3A CN201910965666A CN110797965B CN 110797965 B CN110797965 B CN 110797965B CN 201910965666 A CN201910965666 A CN 201910965666A CN 110797965 B CN110797965 B CN 110797965B
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- bus bar
- power
- transfer
- contactor
- controller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/42—Arrangements or adaptations of power supply systems
- B64G1/428—Power distribution and management
Abstract
The invention belongs to the field of power supply and distribution of power supply systems, and discloses a power conversion structure and a power conversion method, wherein the power conversion structure comprises the following steps: the controller, the main bus bar, a plurality of branch bus bars, a plurality of transfer electric contactors and a plurality of power switches, wherein the number of the branch bus bars, the number of the transfer electric contactors and the number of the power switches are the same, and the plurality of power switches are different types of power switches; the power switches are respectively connected with the switch signal input ends of the controller, the voltage acquisition ends of the branch bus bars are respectively connected with the voltage signal acquisition ends of the controller, the control signal output ends of the controller are respectively connected with the power positive input ends of the plurality of transfer contactors, the power supply negative input ends of the plurality of transfer electric contactors are grounded, and the main contact of each transfer electric contactor controls the on-off of the corresponding branch bus bar and the main bus bar, so that transfer electricity among different power supplies is realized.
Description
Technical Field
The invention belongs to the field of power supply and distribution of power supply systems, and particularly relates to a power conversion structure and a power conversion method, which are applied to the field of power supply conversion and power supply design among bus bars in a power supply system on an aircraft.
Background
The invention is used for power conversion and power supply among bus bars in a power supply system, and when the power supply system has various power supplies, such as a ground power supply, a storage battery, a secondary power supply, a power generation system and the like, in practice, the conversion and power supply to system equipment are required to be realized among different power supplies in different use stages and use requirements.
At present, a discharging and converting system before the emission of a lithium battery of an aircraft and a control method (201410706624.5) for realizing discharging and converting by adopting the system are applied to the field of discharging of the lithium battery, and focus on the fact that the voltage value of the pre-discharging of the lithium battery is larger than or equal to the calibrated converting voltage, and the converting is controlled by a computer to realize discharging and converting of the lithium battery. The invention is only limited to voltage comparison and then realizes the discharging and power conversion of the lithium battery, can not realize the power conversion among different power supplies, has single function, and has no design such as isolation protection.
Disclosure of Invention
In view of the above problems, the present invention provides a power conversion structure and method, which uses a controller to manage the connection condition of a conversion contactor between bus bars, and based on the combination of a bus bar voltage comparison and discrimination mechanism, auxiliary contact information of the contactor, an external switch instruction, etc., realizes power conversion between different power sources, and sets isolation protection, power conversion logic design, stability protection design after power conversion is completed, conversion logic design between bus bars, and power conversion time adjustable design.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme.
The technical scheme is as follows:
a transfer structure, the transfer structure comprising: the controller, the main bus bar, a plurality of branch bus bars, a plurality of transfer electric contactors and a plurality of power switches, wherein the number of the branch bus bars, the number of the transfer electric contactors and the number of the power switches are the same, and the plurality of power switches are different types of power switches;
a plurality of power switches are respectively connected with the switch signal input end of the controller, the voltage acquisition ends of a plurality of branch bus bars are respectively connected with the voltage signal acquisition end of the controller, the control signal output end of the controller is respectively connected with the power positive input ends of the plurality of transfer electric contactors, the power negative input ends of the plurality of transfer electric contactors are grounded, and the main contact of each transfer electric contactor controls the on-off of the corresponding branch bus bar and the main bus bar.
The first technical scheme of the invention is characterized in that:
the power conversion structure further comprises: and each relay is connected with the power negative input end of the corresponding transfer electric contactor respectively.
The second technical scheme is as follows:
a transfer method, the said method is used for technical scheme one the said transfer structure, record the first power switch as the power switch of the first branch bus bar, the main contact of the first transfer contactor controls the first branch bus bar to break-make with main bus bar;
the first power switch realizes a power supply switching instruction through manual operation;
the controller collects an instruction of the first power switch, and collects a voltage value on the main bus bar and a voltage value on the first branch bus bar;
the controller obtains a voltage difference value between a voltage value on the main bus bar and a voltage value on the first branch bus bar; and if the voltage difference value meets a preset condition, controlling the first transfer contactor to transfer electricity.
The second technical proposal of the invention has the characteristics and further improvement that:
(1) When the current branch bus bar connected with the main bus bar is not powered, the controller automatically opens the corresponding transfer electric contactor to control the emergency bus bar to be connected with the main bus bar, and the emergency bus bar is any one bus bar among a plurality of branch bus bars.
(2) If the voltage difference value meets a preset condition, controlling the first transfer contactor to transfer electricity, wherein the method specifically comprises the following steps:
if the voltage difference value meets a preset condition, a second control signal is sent to the second transfer electric contactor, wherein the second control signal is used for controlling the second transfer electric contactor to disconnect the second branch bus bar from the main bus bar; the second branch bus bar is a bus bar currently connected with the main bus bar;
and after the power conversion time interval is met, a first control signal is sent to the first power conversion contactor, and the first control signal is used for controlling the first power conversion contactor to realize the connection of the corresponding first branch bus bar and the main bus bar.
(3) The power transfer time interval is preset by the controller.
(4) If the voltage difference meets the preset condition, the method specifically comprises the following steps:
when the voltage value on the first branch bus bar is lower than the voltage value on the main bus bar, judging that the voltage difference value between the voltage value on the first branch bus bar and the voltage value on the main bus bar meets a preset condition, and controlling the first transfer electric contactor to transfer electricity;
and when the voltage value on the first branch bus bar is higher than the voltage value on the main bus bar, directly controlling the first transfer electric contactor to transfer electricity.
(5) And after the first transfer contactor is controlled to transfer electricity, the controller increases the voltage difference range in the preset condition.
(6) Each relay disconnects the corresponding branch bus bar from the main bus bar by cutting off the power negative input of the corresponding transfer contactor.
The invention solves the defects of reverse flow, power conversion failure and the like of the traditional power conversion between different bus bars through the technical scheme, has the characteristics of good power conversion stability, isolation protection and power conversion switching functions between different power supplies, adjustable power conversion time and the like, has been practically applied to specific models, has good use effect and has wide popularization and application prospects.
Drawings
Fig. 1 is a schematic circuit structure diagram of a power conversion structure according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a power conversion method, which mainly comprises the following steps: a controller, a bus bar, a transfer contactor, a relay and an external operating switch.
The controller is used for receiving an external operation switch instruction, collecting different power supply voltage values on the comparison bus, controlling the power input end of the power transfer contactor, collecting auxiliary contacts of the power transfer contactor and controlling the power input end of the relay, realizing related control functions by performing internal logic processing through the control instructions, and also realizing the adjustable setting of the power transfer time.
Specifically, the external operation switch command is a command for inputting a high or low level signal to the controller by a manual operation switch to realize certain power supply conversion and power supply. The bus bar is a power supply end in the power supply system, the controller collects and compares different power supply voltage values on the bus bar, if the voltage difference value between the bus bars meets a preset value, the controller outputs a control signal of the transfer contactor, after the transfer is completed, the voltage difference value between the bus bars meets the preset value to automatically adjust an upper limit value, the fluctuation of the voltage difference value in a small range between the short-time bus bars is prevented from influencing the transfer contactor of the bus bars to generate a clapping phenomenon, the stability design after the transfer is completed is realized, if the upper limit value is exceeded, the transfer contactor is disconnected, whether the preset value of the voltage difference value is met is judged again in real time, and the anti-reflux effect is realized so as to protect the power supply system. The transfer contactor is arranged between the two bus bars, and the transfer of different power supplies on the bus bars is realized by switching on and off the transfer contactor. The relay is used for switching on and off logic control of different transfer electric contactors, and damage possibly caused by switching on different power supplies due to the fact that different transfer electric contactors are simultaneously switched on is prevented.
According to the invention, the relay (GB 3) is controlled by the controller (KZQ) to realize signal control at one end of the transfer electric contactor (GB 1), and the other end of the transfer electric contactor (GB 1) and one end of the transfer electric contactor (GB 2) output control signals by the controller (KZQ) or other related controllers after meeting certain criterion conditions, so that power conversion among bus bars is realized.
The controller (KZQ) compares the voltages of the collected bus bars (WP 1, WP2 and WP 3), and outputs a bus bar to electric contactor control signal if the voltage difference between the bus bars meets a preset value.
The relay GB3 is used for realizing the logic sequence of switching on and switching off between the contactors GB2 and GB 1; namely, when the contactor GB2 is turned on, the relay GB3 acts, so that the contactor GB1 is prohibited from being turned on, and damage possibly caused by the connection between different power supplies is avoided.
The invention sets a protection measure in the process of converting electricity: the controller (KZQ) compares the bus bar voltage in real time, when the controller outputs a control signal of the transfer contactor, after transfer is completed, the voltage difference between the bus bars meets a preset value, an upper limit value is automatically adjusted, the fluctuation of the voltage difference in a small range between the short-time bus bars is prevented from affecting the transfer contactor of the bus bars to generate a clapping phenomenon, if the upper limit value is exceeded, the transfer contactor is disconnected, whether the preset value of the voltage difference is met is judged again in real time, and backflow prevention is realized, so that a power supply system is protected.
In the present invention, when the bus bar WP2 is not powered, the power conversion contactor GB1 is automatically turned off, and the controller (KZQ) determines whether the bus bar WP1 can be converted to power supply by the bus bar WP 3.
The invention can realize the adjustable power conversion time setting through the controller.
The invention solves the defects of reverse flow, power conversion failure and the like in the traditional power conversion between different bus bars, has the characteristics of good power conversion stability, isolation protection, power conversion switching function, adjustable power conversion time and the like between different power supplies, has been practically applied to specific models, has good use effect and has wide popularization and application prospects.
The foregoing is merely a detailed description of the invention, which is not a matter of routine skill in the art. However, the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method of converting electricity for a converting electricity structure, the converting electricity structure comprising: the controller, the main bus bar, a plurality of branch bus bars, a plurality of transfer electric contactors and a plurality of power switches, wherein the number of the branch bus bars, the number of the transfer electric contactors and the number of the power switches are the same, and the plurality of power switches are different types of power switches;
the power supply switches are respectively connected with the switch signal input end of the controller, the voltage acquisition ends of the branch bus bars are respectively connected with the voltage signal acquisition end of the controller, the control signal output end of the controller is respectively connected with the power supply positive input ends of the plurality of transfer electric contactors, the power supply negative input ends of the plurality of transfer electric contactors are grounded, and the main contact of each transfer electric contactor controls the on-off of the corresponding branch bus bar and the main bus bar;
the power conversion structure further comprises: the relays are respectively connected with the power negative input ends of the corresponding transfer electric contactors;
the first power switch is a power switch of a first branch bus bar, and a main contact of the first transfer electric contactor controls the on-off of the first branch bus bar and the main bus bar;
the first power switch realizes a power supply switching instruction through manual operation;
the controller collects an instruction of the first power switch, and collects a voltage value on the main bus bar and a voltage value on the first branch bus bar;
the controller obtains a voltage difference value between a voltage value on the main bus bar and a voltage value on the first branch bus bar; and if the voltage difference value meets a preset condition, controlling the first transfer contactor to transfer electricity.
2. A power conversion method according to claim 1, wherein,
when the current branch bus bar connected with the main bus bar is not powered, the controller automatically opens the corresponding transfer electric contactor to control the emergency bus bar to be connected with the main bus bar, and the emergency bus bar is any one bus bar among a plurality of branch bus bars.
3. The method according to claim 1, wherein if the voltage difference meets a preset condition, controlling the first transfer contactor to transfer electricity comprises:
if the voltage difference value meets a preset condition, a second control signal is sent to the second transfer electric contactor, wherein the second control signal is used for controlling the second transfer electric contactor to disconnect the second branch bus bar from the main bus bar; the second branch bus bar is a bus bar currently connected with the main bus bar;
and after the power conversion time interval is met, a first control signal is sent to the first power conversion contactor, and the first control signal is used for controlling the first power conversion contactor to realize the connection of the corresponding first branch bus bar and the main bus bar.
4. A method of converting electricity according to claim 3, wherein the time interval for converting electricity is preset by the controller.
5. The method according to claim 1, wherein if the voltage difference satisfies a predetermined condition, the method specifically comprises:
when the voltage value on the first branch bus bar is lower than the voltage value on the main bus bar, judging that the voltage difference value between the voltage value on the first branch bus bar and the voltage value on the main bus bar meets a preset condition, and controlling the first transfer electric contactor to transfer electricity;
and when the voltage value on the first branch bus bar is higher than the voltage value on the main bus bar, directly controlling the first transfer electric contactor to transfer electricity.
6. The method of claim 1, wherein the controller increases the voltage difference range in the predetermined condition after the first transfer contactor is controlled to transfer power.
7. A method of converting electricity according to claim 1, wherein each relay disconnects the corresponding branch bus bar from the main bus bar by cutting off the power negative input of the corresponding converting contactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910965666.3A CN110797965B (en) | 2019-10-11 | 2019-10-11 | Electricity conversion structure and method |
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| CN201910965666.3A CN110797965B (en) | 2019-10-11 | 2019-10-11 | Electricity conversion structure and method |
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| CN110797965B true CN110797965B (en) | 2023-04-28 |
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| CN112242693A (en) * | 2020-09-25 | 2021-01-19 | 中国直升机设计研究所 | Direct current bus bar short-circuit protection device and method |
| CN112895974B (en) * | 2021-01-19 | 2022-10-18 | 四川腾盾科技有限公司 | Method for increasing the reliability of an onboard battery system and corresponding operating method |
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